Archery extension bar

ABSTRACT

An archery extension bar that attenuates vibration transmitted to a fixing portion due to vibration caused by restoration of a bow part after shooting of an arrow. The archery extension bar (3) includes: a support portion (9) having a predetermined length; a fixing portion (10), which is located on one end side of the support portion (9) in a longitudinal direction, and is configured to be fixed to a bow part (1); and a mounting portion (11), which is located on another end side of the support portion, and is configured to allow a sight (5) to be mounted thereto. The support portion has a small vertical sectional area portion (13), which has a vertical sectional area smaller than a vertical sectional area of the fixing portion and extends over an entire range or a part of a range of the support portion in the longitudinal direction.

TECHNICAL FIELD

The present invention relates to an archery extension bar that allows an archery sight to be positioned in front of a bow main body portion.

BACKGROUND ART

In archery, a sight is arranged at a position away from eyes of an archer by a predetermined distance in a direction toward a target so as to allow the archer to aim at the target more accurately. In order to achieve such positioning of the sight, the sight is mounted at a distal end of an extension bar that is fixed so as to extend forward from a bow part (see, for example, Patent Literature 1).

The extension bar fixed to the bow part vibrates due to an impact of vibration caused by restoration of the bow part after shooting of an arrow. Thus, the sight which is mounted at the distal end of the extension bar is also subjected to vibration.

The sight includes a plurality of components. When the sight is subjected to a strong impact, there arises a problem in that connection between the components of the sight is loosened, which may result in difficulty in precise positioning of the sight in its original position. Further, when a gap is formed between the components of the sight due to loosened connection between the components, and the sight is subjected to strong vibration, the components may rub or collide against each other to generate abnormal noise. As a result, there has been a problem in that such abnormal noise may heavily stress an archer who requires intense concentration.

Hitherto, the following measure has been made to solve the above-mentioned problems. A vibration absorber made of an elastic material in a cylindrical shape is fitted onto an outer periphery of the extension bar so that the vibration absorber absorbs the vibration of the extension bar, thereby attenuating the vibration of the extension bar and reducing the vibration which may be transmitted to the sight.

CITATION LIST Patent Literature

[PTL 1] JP 2007-315746 A

SUMMARY OF INVENTION Technical Problem

However, the above-mentioned measure for reducing the vibration of the extension bar has the following problems. The vibration absorber absorbs the vibration of the extension bar. Thus, in order to increase a vibration absorbing effect, it is required that the vibration absorber be thickened. As a result, the thickened vibration absorber may obstruct the view of an archer. Further, when the thickness of the vibration absorber is reduced so as to prevent the vibration absorber from obstructing the view of the archer, the view of the archer is prevented from being obstructed. However, there may arise a problem in that a satisfactory vibration absorbing effect is not obtained.

Further, there also arise problems such as a need to keep a vibration absorber available at all times or a need for inevitable complicated work for fitting the vibration absorber over the extension bar.

The inventor of the present invention has conducted tests and studies to solve the above-mentioned problems. As a result of the tests and studies, the inventor of the present invention has found that a shape of the extension bar itself is the key to solve the problems, and has achieved the present invention.

An object of the present invention is to provide an archery extension bar having a function to attenuate vibration caused by restoration of a bow part after shooting of an arrow.

Solution to Problem

In order to achieve the above-mentioned object, according to the invention described in claim 1, there is provided an archery extension bar including: a support portion having a predetermined length; a fixing portion, which is located on one end side of the support portion in a longitudinal direction of the support portion, and is configured to be fixed cc a bow part; and a mounting portion, which is located on another end side of the support portion, and is configured to allow a sight to be mounted thereto, wherein the support portion has a small vertical sectional area portion, which has a vertical sectional area smaller than a vertical sectional area of the fixing portion and extends over an entire range or a part of a range of the support portion in the longitudinal direction.

According to the invention described in claim 1, the support portion has the small vertical sectional area portion with the vertical sectional area smaller than the vertical sectional area of the fixing portion, which extends over an entire range or a part of a range of the support portion in the longitudinal direction. Thus, vibration which is transmitted to the fixing portion due to an impact caused by restoration of a bow portion after shooting of an arrow is attenuated through the small vertical sectional area portion of the support portion, thereby being capable of reducing a range of swinging movement of a distal end of the extension bar and quickly stopping the swinging movement. As a result, the vibration of the sight is also reduced, thereby being capable of preventing loosening of connection between or a displacement of components of the sight. Thus, the sight can easily and precisely be positioned at its original position. Further, loosening of the connection between the components of the sight can be prevented. Thus, abnormal noise which may be generated by rubbing or collision of the components against each other can be reduced.

According to the invention described in claim 2, in the invention described in claim 1, the small vertical sectional area portion has a gradually reduced portion with a vertical sectional area gradually reduced from the fixing portion side toward the mounting portion side.

According to the invention described in claim 2, the small vertical sectional area portion has the gradually reduced portion with the vertical sectional area gradually reduced from the fixing portion side toward the mounting portion side. Thus, the vertical sectional area of the support portion can be gradually reduced toward the distal end. Accordingly, the vibration can be effectively attenuated.

According to the invention described in claim 3, in the invention according to claim 1 or 2, the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and The small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction.

According to the invention described in claim 3, the support portion, the fixing portion, and the mounting portion are formed integrally as the plate-like member having an elongated shape. The small vertical sectional area portion is formed by setting the vertical length of the support portion in the up-and-down direction smaller than, the vertical length of the fixing portion in the up-and-down direction over the entire range or a part of the range of the support portion in the longitudinal direction. Thus, the support portion having the small vertical sectional area portion with the vertical sectional area smaller than the vertical sectional area of the fixing portion can easily be formed.

According to the invention described in claim 4, in the invention described in claim 1 or 2, the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction and setting a width of the support portion in a thickness direction smaller than a width of the fixing portion in the thickness direction over the entire range or the part of the range of the support portion in the longitudinal direction.

According to the invention described in claim 4, the support portion, the fixing portion, and the mounting portion are formed integrally as the plate-like member having an elongated shape. The small vertical sectional area portion is formed by setting the vertical length of the support portion in the up-and-down direction smaller than the vertical length of the fixing portion in the up-and-down direction over the entire range or a part of the range of the support portion in the longitudinal direction and setting the width of the support portion in the thickness direction smaller than the width of the fixing portion in the thickness direction over the entire range or a part of the range of the support portion in the longitudinal direction. Thus, the support portion having the small vertical sectional area portion with the vertical sectional area smaller than the vertical sectional area of the fixing portion can more easily be formed.

According to the invention described in claim 5, in the invention described in claim 3 or 4, the plate-like member includes: a main member having a substantially rectangular shape with a length in the longitudinal direction corresponding to a sum of lengths of the fixing portion, the support portion, and the mounting portion; and a sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than a vertical length of the main member in the up-and-down direction and a length in the longitudinal direction set smaller than a length corresponding to a sum of the lengths of the fixing portion and the support portion, and the plate-like member is completed by firmly fixing the sub member to one end portion of the main member.

According to the invention described in claim 5, the plate-like member includes: the main member having a substantially rectangular shape with the length in the longitudinal direction corresponding to the sum of the lengths of the fixing portion, the support portion, and the mounting portion; and the sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than the vertical length of the main member in the up-and-down direction and the length in the longitudinal direction set smaller than the length corresponding to the sum of the lengths of the fixing portion and the support portion in the longitudinal direction, and the plate-like member is completed by firmly fixing the sub member to one end portion of the main member. Thus, the extension bar including the fixing portion, the support portion having the small vertical sectional area portion with the vertical sectional area smaller than the vertical sectional area of the fixing portion, and the mounting portion can easily be manufactured by firmly fixing the plurality of members, each having a substantially rectangular shape, which are relatively easy to form.

Advantageous Effects of Invention

With the archery extension bar according to the present invention, vibration which is transmitted to the fixing portion due to an impact of vibration caused by the restoration of the bow part after shooting of an arrow can be attenuated through the small vertical, sectional area portion of the support portion. Thus, the range of swinging movement of the distal end of the archery extension bar is reduced, and the swinging movement is quickly stopped. As a result, vibration of the sight is also reduced, thereby being capable of preventing loosening of connection between or a displacement of the components of the sight. Thus, the sight can easily and reliably be positioned at its precise original position. Further, loosening of the connection between the components of the sight can be prevented. Thus, abnormal noise which may be generated by rubbing or collision of the components against each other can be reduced. Accordingly, in archery that requires intense concentration, a stress on an archer due to abnormal noise can be eased.

Further, unlike related-art extension bars, an impact absorber not required. Thus, a problem such as the obstruction of the view of an archer does not occur. Further, an archer can be freed from the problems such as a need to keep an impact absorber available all the time or a need for complicated work for fitting an impact absorber onto the extension bar.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is an explanatory overall view illustrating an archery bow in a state in which a sight is mounted to an archery extension bar fixed to a bow part through intermediation of a fixing member.

FIG. 2 is an explanatory view for illustrating the extension bar onto which the fixing member and the sight illustrated in FIG. 1 are mounted.

FIG. 3 is a side view for illustrating the archery extension bar according to a first embodiment of the present invention.

FIG. 4 is a plan views of the extension bar illustrated in FIG. 3 .

FIG. 5 is a side view for illustrating another example of a support portion of the extension bar according to the first embodiment.

FIG. 6 is a side view for illustrating another example of the support portion of the extension bar according to the first embodiment.

FIG. 7 is a side view for illustrating another example of the support portion of the extension bar according to the first embodiment.

FIG. 8 is a side view for illustrating another example of the support portion of the extension bar according to the first embodiment.

FIG. 9 is a perspective view for illustrating an archery extension bar according to a second embodiment of the present invention.

FIG. 10 is a plan view of the extension bar illustrated in FIG. 9 .

FIG. 11 is a perspective view for illustrating an archery extension bar according to a third embodiment of the present invention.

FIG. 12 is an explanatory exploded view of the extension bar illustrated in FIG. 11 .

DESCRIPTION OF EMBODIMENTS

Now, an archery extension bar according to a first embodiment of the present invention is described in detail with reference to the accompanying drawings.

FIG. 1 to FIG. 8 are views for illustrating the archery extension bar according to the first embodiment of the present invention FIG. 1 is an explanatory overall view for illustrating an archery bow in a state in which a sight is mounted to an archery extension bar fixed to a bow part through intermediation of a fixing member. FIG. 2 is an explanatory view for illustrating the extension bar onto which the fixing member and the sight illustrated in FIG. 1 are mounted. FIG. 3 is a side view for illustrating the archery extension bar according to the first embodiment of the present invention FIG. 4 is a plan view of the extension bar illustrated in FIG. 3 . FIG. 5 , FIG. 6 , FIG. 7 , and FIG. 8 are side views for illustrating another examples of a support portion of the extension bar according to the first embodiment.

An archery bow includes, as illustrated in FIG. 1 , a bow part 1 and a string 2. An extension bar 3 is provided to the bow part 1 so as to extend forward from the bow part 1. The extension bar 3 has one end fixed to the bow part 1 through intermediation of a fixing member 4 and another end to which a sight 5 is mounted.

As illustrated in FIG. 2 , the fixing member 4 is mounted to one end of the extension bar 3, and the sight 5 is mounted to another end of the extension bar 3.

The fixing member 4 is a plate-like or cylindrical member. The fixing member 4 includes a mounting mechanism and a fixing mechanism. The mounting mechanism allows the fixing member 4 to be removably mounted to the extension bar 3. The fixing mechanism allows the extension bar 3 to be fixed to the bow part. In this embodiment, the fixing member 4 has, as the mounting mechanism, a screw S and a through hole (not shown) that allow the extension bar 3 to be threadedly fixed to the fixing member 4. Further, the fixing member 4 has, as the fixing mechanism, a through hole H to allow the extension bar 3 to be threadedly fixed to the bow part 1.

The sight 5 includes a sight main body 6 and an elevation bar 7. The sight main body 6 includes a sight pin. The elevation bar 7 supports the sight main body 6 so that the sight main body 6 can be moved and adjusted in an up-and-down direction. The sight 5 is mounted to the extension bar 3 through intermediation of a mounting member 8.

The extension bar 3 according to the first embodiment of the present invention is formed of an elongated member. The extension bar 3 includes a support portion 9, a fixing portion 10, and a mounting portion 11. The support portion 9 has a predetermined length. The fixing portion 10 is located on one end side of the support portion 9 in a longitudinal direction of the support portion 9, and is configured to be fixed to the bow part 1. The mounting portion 11 is located on another end side of the support portion 9, and is configured to allow the sight 5 to be mounted thereto. Further, in the first embodiment, the support portion 9, the fixing portion 10, and the mounting portion 11 are formed integrally as a plate-like member 12 having an elongated shape, and there is no particular partition to separate the support portion 9, the fixing portion 10, and the mounting portion 11 from each other.

Any publicly known material used for the conventional extension bar may be used as a material of the extension bar 3. For example, aluminum or carbon fiber may be used.

The support portion 9 has a small vertical sectional area portion 13. The small vertical sectional area portion 13 has a vertical sectional area smaller than a vertical sectional area of the fixing portion 10 over an entire range or a part of a range of the support portion 9 in the longitudinal direction. In the first embodiment, the small vertical sectional area portion 13 is formed by setting a vertical length of the support portion 9 in the up-and-down direction smaller than a vertical length of the fixing portion 10 in the up-and-down direction.

The support portion 9 according to the first embodiment has a small vertical sectional area portion start position 13 a and a small vertical sectional area portion end position 13 b. The small vertical sectional area portion 13 starts at the small vertical sectional area portion start position 13 a, and the small vertical sectional area portion start position 13 a matches a position of a fixing portion-side end portion 14 of the support portion 9. The small vertical sectional area portion 13 ends at the vertical sectional area end position 13 b, and the small vertical sectional portion end position 13 b matches a position of a mounting portion-side end portion 15. A range of the small vertical sectional area portion 13 is not limited to a particular range, and thus is not limited to the range in the first embodiment. It is preferred that the small vertical sectional area portion end position 13 b be set in the vicinity of the mounting portion-side end portion 15 so that the small vertical sectional area portion 13 is as close as possible to a distal end of the extension bar 3 for the purpose of effectively attenuating vibration. It is more preferred that the small vertical sectional area portion end position 13 b match the position of the mounting portion-side end portion 15.

Further, the small vertical sectional area portion 13 according to the first embodiment has a gradually reduced portion 16. The gradually reduced portion 16 has a vertical sectional area that is gradually reduced from the fixing portion 10 side toward the mounting portion 11 side.

The gradually reduced portion 16 according to the first embodiment has an upper side and a lower side that are inclined so as to become closer to each other, and has a tapered shape with a gradually reduced vertical length in the up-and-down direction. A position and a range of the gradually reduced portion 16 are not limited to particular position and range. In the first embodiment, a gradually reduced portion start position 16 a at which the gradually reduced portion 16 starts and the small vertical sectional area portion start position 13 a are set to match each other, and a gradually reduced portion end position 16 b at which. the gradually reduced portion 16 ends and. the small vertical sectional area portion end position 13 b are set to match each other. The small vertical sectional area portion 13 may have any shape as long as its vertical sectional area is smaller than the vertical sectional area of the fixing portion 10. However, when the gradually reduced portion 16 is formed as in the first embodiment, the vertical sectional area of the support portion 9 can be gradually reduced toward its distal end. Thus, vibration can be effectively attenuated. Further, the gradually reduced portion 16 according co the first embodiment has the upper side and the lower side that are inclined so as to become closer to each other. Thus, the vertical sectional area of the support portion 9 can be smoothly reduced toward its distal end. As a result, vibration can be more effectively attenuated.

Further, in the first embodiment, a minimum vertical sectional area. portion 13 c having a minimum vertical sectional area is located at the small vertical sectional area end position 13 b. A position of the minimum vertical sectional area portion 13 c is not limited to a particular position. However, it is desired that the minimum vertical sectional area portion 13 c be located in the vicinity of the small vertical sectional area. end. position 13 b so as to be as close as possible to the distal end for the purpose of effectively attenuating vibration.

Further, in the first embodiment, the minimum vertical sectional area portion 13 c does not have a width in the longitudinal direction. However, the minimum vertical sectional area portion 13 c is not limited to such a minimum vertical sectional area portion. The minimum vertical sectional area portion 13 c may also have a width in the longitudinal direction.

Now, modification examples of the support portion 9 according to the first embodiment are described with reference to FIG. 5 to FIG. 8 .

Unlike the support portion 9 illustrated in FIG. 3 , a small vertical sectional area. start position 13 a of small longitudinal sectional area portion 13 of a support portion 9 illustrated in FIG. 5 is located closer to a mounting portion 11 than a fixing portion-side end portion 14 of the support. portion 9. Further, a vertical length of the fixing portion-side end portion 14 in the up-and-down direction is larger than a vertical length of the fixing portion 10. A vertical sectional area of a portion of the support portion 9, which is closer to the fixing portion 10 than the small vertical sectional area. portion 13 of the support portion 9 is, is larger than a vertical sectional area of the fixing portion 10.

As described above, the support portion 9 may have a vertical sectional area portion with a vertical sectional area larger than the vertical sectional area of the fixing portion 10.

Unlike the support portion 9 illustrated in FIG. 3 , a support portion 9 illustrated in FIG. 6 includes a gradually reduced portion 16 having a gradually reduced vertical length in the up-and-down direction. The gradually reduced portion 16 has an upper side and a lower side that are stepped in such a manner as to become closer to each other in a direction from a fixing portion 10 side toward a mounting portion 11 side.

As described above, the gradually reduced portion 16 may have any shape as long as its vertical sectional area. is gradually reduced from the fixing portion 10 side toward the mounting portion 11 side.

Unlike the support portion 9 illustrated in FIG. 3 , a support portion 9 illustrated in FIG. 7 does not include the gradually reduced portion 16. A vertical sectional area of a small vertical sectional area portion 13 at a small vertical sectional area portion start position 13 a is set smaller than a vertical sectional area of a fixing portion 10. Further, the small vertical sectional area portion 13 has an upper side and a lower side that are parallel to each other. A minimum vertical sectional area portion 13 c is formed to extend from the small vertical sectional area start position 13 a to a small vertical sectional area end position 13 b over the entire range of the small vertical sectional area portion 13 in the longitudinal direction.

As described above, the support portion 9 is not required to include the gradually reduced portion 16. Further, the minimum vertical sectional area portion 13 c may extend over the entire range of the small vertical sectional area portion 13 in the longitudinal direction.

Unlike the support portion 9 illustrated in FIG. 3 , a support portion 9 illustrated in FIG. 8 includes a small vertical sectional area portion 13 having a protruding small vertical sectional area portion 13 d. The protruding small vertical sectional area portion 13 d has a vertical length in the up-and-down direction, which does not exceed a vertical length of a fixing portion 10 in the up-and-down direction.

As described above, the small vertical sectional area portion 13 may have a portion with a vertical sectional area gradually increasing toward its distal end.

A ratio of the vertical sectional area. of the minimum vertical sectional area portion 13 c of the small vertical sectional area portion 13 of the support portion 9 to the vertical sectional area. of the fixing portion 10 is determined based. on, for example, a material of the extension bar 3, a length of the extension bar 3 in the longitudinal direction, a magnitude of the vertical sectional area of the fixing portion 10, a shape of the support portion 9, the position and the range of the small vertical sectional area portion 13, the presence or absence of the gradually reduced. portion 16, and the position. and the range of the gradually reduced portion 16. The above-mentioned ratio is not limited to a particular ratio as long as the small vertical sectional area. portion 13 can sufficiently attenuate vibration. When the vertical sectional area of the minimum vertical sectional area portion 13 c is set to 95% of the vertical sectional area of the fixing portion 10, it is found that vibration is attenuated by about 14%. Thus, even a small degree of reduction is effective.

Further, in the first embodiment, the fixing portion 10 has positioning screw holes 17. Each of the positioning screw holes 17 has a shape corresponding to a shape of the screw S included in the mounting mechanism of the fixing member 4 for the extension bar 3. The screw S which has been inserted through the through hole of the fixing member 4, is threadedly fitted. into the one of the positioning screw hole 17 to thereby threadedly fix the extension bar 3 to the fixing member 4. The fixing portion 10 has a plurality of positioning screw holes 17 arranged in the longitudinal direction of the fixing portion 10. In fixing of the fixing portion 10, any of the positioning screws holes 17 is selected to adjust a distance from the bow part 1 to the sight 5.

The extension bar 3 may be mounted to the fixing member 4 by a method other than threaded as long as the extension bar 3 is reliably fixed to the fixing member 4. For example, the following method. may be used. The fixing member 4 is formed. as a cylindrical body. A screw hole into which the screw S is to be threadedly fixed is formed in place of the through hole of the fixing member. Positioning recessed portions are formed in place of the positioning screw holes 17 of the fixing portion 10 of the extension bar 3. The screw S is threadedly fitted into the screw hole of the fixing member 4, and a distal end of the screw S is fitted into the positioning recessed portion to thereby determine a position at which the extension bar 3 is mounted. At the same time, the extension bar 3 is pressed by the distal end of the screw S to be brought into pressure contact with the fixing member 4. In this manner, the extension bar 3 is mounted to the fixing member 4.

Further, in the first embodiment, the mounting portion 11 has a mounting screw hole 18 for threadedly fixing the mounting portion 11 to the mounting member 8. A method. of mounting the sight 5 to the mounting portion 11 is not limited. to threaded fixing, and other methods may be used.

In the extension bar 3 having the above-mentioned configuration according to the first embodiment, the support portion 9 has the small vertical sectional area portion 13 with a vertical sectional area smaller than the vertical sectional area of the fixing portion 10. The small vertical sectional area portion 13 extends over the entire range or a part of the range of the support portion 9 in the longitudinal direction. Thus, vibration transmitted to the fixing portion 10 due to an impact caused by restoration of the bow part 1 after shooting of an arrow is attenuated through the small vertical sectional area portion 13 of the support portion 9, thereby being capable of reducing a range of swinging movement of the distal end of the extension bar 3 and quickly stopping the swinging movement. As a result, the vibration of the sight 5 is also reduced, thereby being capable of preventing loosening of connection between or a displacement of the components of the sight 5. Thus, the sight 5 can easily and reliably be positioned at its precise original position. Further, the loosening of connection between the components of the sight 5 is prevented. Thus, abnormal noise which. may be generated. by rubbing or collision of the components against each other can be reduced.

Further, the small vertical sectional area portion 13 has the gradually reduced portion 16 with a vertical sectional area gradually reduced from the fixing portion 10 side toward. the mounting portion 11 side. Thus, the vertical sectional area of the support portion 9 can be gradually reduced toward the distal end of the support. portion 9. Accordingly, vibration can be effectively attenuated.

Further, the support portion 9, the fixing portion 10, and the mounting portion 11 can be formed integrally as the plate-like member 12 having an elongated shape. Further, the small, vertical sectional area portion 13 is formed by setting the vertical length of the support portion 9 in the up-and-down direction smaller than the vertical length of the fixing portion 10 in the up-and-down direction. Thus, the support portion 9 having the small vertical sectional area portion 13 with a vertical sectional area smaller than the vertical sectional area of the fixing portion 10 can easily be formed.

FIG. 9 and FIG. 10 are views for illustrating an archery extension bar according to a second embodiment of the present invention FIG. 9 is a perspective view for illustrating the archery extension bar according to the second embodiment. FIG. 10 is a plan view of the archery extension. bar illustrated in FIG. 9 .

The extension bar 3 according to the second. embodiment is substantially the same as the extension bar 3 according to the first embodiment in its basic configuration, and the same components as those of the extension bar 3 according to the first embodiment are denoted by the same reference symbols description.

A main difference between the second embodiment and the first embodiment lies in a configuration of a small vertical sectional area portion 13 with a vertical sectional area smaller than a vertical sectional area of a fixing portion 10. The small vertical sectional area portion 13 extends over the entire range or a part of the range of a support portion 9 in a longitudinal direction of the support portion 9.

In the second embodiment, the small vertical sectional area portion 13 is formed by setting a vertical length of the support portion 9 in the up-and-down direction smaller than a vertical length of the fixing portion 10 in the up-and-down direction as in the first embodiment and, in addition, setting a width of the support portion 9 in a thickness direction smaller than a width of the fixing portion 10 in the thickness direction.

Other configurations are the same as those of the extension bar according to the first embodiment. Thus, the description in the first embodiment is referred to, and hence description of other configurations is omitted here.

The extension bar 3 having the above-mentioned configuration according to the second embodiment, which includes the support portion 9 having the small vertical sectional area portion 13 with the sectional area smaller than the sectional area of the fixing portion 10, can further easily be formed.

Other effects are the same as those of the extension bar 3 according to the first embodiment. Thus, the description in the first embodiment is referred to, and hence description of other configurations is omitted here.

FIG. 11 and FIG. 12 are views for illustrating an archery extension bar according to a third embodiment of the present invention. FIG. 11 is a perspective view for illustrating the archery extension bar according to the third embodiment, and. FIG. 12 is an explanatory exploded view of the extension bar illustrated in FIG. 11 .

The extension bar 3 according to the third embodiment is substantially the same as the extension bar 3 according to the first embodiment in its basic configuration, and the same components as those of the extension bar 3 according to the first embodiment are denoted by the same reference symbols for description.

A main difference between the third embodiment and the first embodiment lies in a configuration of a plate-like member 12. The plate-like member 12 has a support portion 9, a fixing portion 10, and a mounting portion 11 that are formed integrally.

In the third embodiment, the plate-like member 12 includes a main member 12 a and a sub member 12 b. The main member 12 a has a substantially rectangular shape, and has a length an a longitudinal direction, which corresponds to a sum. of lengths of the support portion 9, the fixing portion 10, and the mounting portion 11. The sub member 12 b has a substantially rectangular shape, and has a vertical length in the up-and-down direction set larger than that of the main member 12 a and a length in the longitudinal direction set smaller than a length corresponding to a sum of the length of the fixing portion 10 and the length of the support portion 9. The plate-like member 12 is completed by firmly fixing the sub member 12 b to one end portion of the main member 12 a, which corresponds to the fixing portion of the extension bar 3.

The use of the plate-like member 12 having the configuration described above allows the achievement of the extension. bar 3 including the fixing portion 10, the support portion 9, and the mounting portion 11. The support portion 9 has the small vertical sectional area portion 13 with a vertical sectional area smaller than a vertical sectional area of the fixing portion 10.

The length of the sub member 12 b is not limited. to a particular length as long as the sub member 12 b allows the formation. of the fixing portion 10 and the support. portion 9 having the small vertical sectional area portion 13. In. the third. embodiment, the length of the sub member 12 b in the longitudinal direction is set to exceed a length of the fixing portion 10, and the sub member 12 b forms a part of the support Portion 9.

Further, the sub member 12 b according to the third. embodiment has a gradually reduced portion 19 at another end thereof. The gradually reduced portion 19 has a vertical length in the up-and-down direction, which is gradually reduced toward another end of the sub member 12 b. The gradually reduced portion 19 allows the extension bar 3 to have a gradually reduced portion 16.

In the third embodiment, the plate-like member 12 is completed by firmly fixing one sub member 12 b to the main member 12 a. However, the number of sub members 12 b to be firmly fixed to the main member 12 a may be two or more. For example, the plate-like member 12 may be completed by firmly fixing two sub members 12 b to the main member 12 a so that the main member 12 a is sandwiched between the two sub members 12 b.

Further, in the third embodiment, the main member 12 a and the sub member 12 b are firmly fixed with use of an adhesive. However, a method of firmly fixing the main member 12 a and the sub member 12 b is not limited to an adhesive. For example, the main member 12 a and the sub member 12 b may be firmly fixed by threaded fixing with use of screws.

The extension bar 3 having the above-mentioned configuration according to the third embodiment, which includes the fixing portion 10, the support portion 9, and the mounting portion 11, can easily be manufactured by firmly fixing a plurality of substantially rectangular members, which are relatively easy to form. The support portion 9 has the small vertical sectional area portion 13 with a vertical sectional area smaller than the vertical sectional area of the fixing portion 10.

Other configurations and effects are the same as those of the extension bar according to the first embodiment. Thus, the description in the first embodiment is referred to, and hence description of other configurations and effects is omitted here.

REFERENCE SIGNS LIST

1 bow part

2 string

3 extension bar

4 fixing member

5 sight

6 sight main body

7 elevation bar

8 mounting member

9 support portion

10 fixing portion

11 mounting portion

12 plate-like member

12 a main member

12 b sub member

13 small vertical sectional area portion

13 a small vertical sectional area portion start position

13 b small vertical sectional area portion end position

13 c minimum vertical sectional area portion

13 d protruding small vertical sectional area. portion

14 fixing portion-side end. portion

15 mounting portion-side end portion

16 Gradually reduced portion

16 a gradually reduced portion start position

16 b gradually reduced portion end. position

17 positioning screw hole

18 mounting screw hole

19 gradually reduced portion

S screw

H through. hole 

1. An archery extension bar, comprising: a support portion having a predetermined length; a fixing portion, which is located on one end side of the support portion in a longitudinal direction of the support portion, and is configured to be fixed to a bow part; and a mounting portion, which is located on another end side of the support portion, and is configured to allow a sight to be mounted thereto, wherein the support portion has a small vertical sectional area portion, which has a vertical sectional area smaller than a vertical sectional area of the fixing portion and extends over an entire range or a part of a range of the support portion in the longitudinal direction.
 2. The archery extension bar according to claim 1, wherein the small vertical sectional area portion has a gradually reduced portion with a vertical sectional area gradually reduced from the fixing portion side toward the mounting portion side.
 3. The archery extension bar according to claim 1, wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction.
 4. The archery extension bar according to claim 1, wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction and setting a width of the support portion in a thickness direction smaller than a width of the fixing portion in the thickness direction over the entire range or the part of the range of the support portion in the longitudinal direction.
 5. The archery extension bar according to claim 3, wherein the plate-like member includes: a main member having a substantially rectangular shape with a length in the longitudinal direction corresponding to a sum of lengths of the fixing portion, the support portion, and the mounting portion; and a sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than a vertical length of the main member in the up-and-down direction and a length in the longitudinal direction set smaller than a length corresponding to a sum of the lengths of the fixing portion and the support portion, and wherein the plate-like member is completed by firmly fixing the sub member to one end portion of the main member.
 6. The archery extension bar according to claim 2, wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction.
 7. The archery extension bar according to claim 2, wherein the support portion, the fixing portion, and the mounting portion are formed integrally as a plate-like member having an elongated shape, and wherein the small vertical sectional area portion is formed by setting a vertical length of the support portion in an up-and-down direction smaller than a vertical length of the fixing portion in the up-and-down direction over the entire range or the part of the range of the support portion in the longitudinal direction and setting a width of the support portion in a thickness direction smaller than a width of the fixing portion in the thickness direction over the entire range or the part of the range of the support portion in the longitudinal direction.
 8. The archery extension bar according to claim 4, wherein the plate-like member includes: a main member having a substantially rectangular shape with a length in the longitudinal direction corresponding to a sum of lengths of the fixing portion, the support portion, and the mounting portion; and a sub member having a substantially rectangular shape with a vertical length in the up-and-down direction set larger than a vertical length of the main member in the up-and-down direction and a length in the longitudinal direction set smaller than a length corresponding to a sum of the lengths of the fixing portion and the support portion, and wherein the plate-like member is completed by firmly fixing the sub member to one end portion of the main member. 